The reaction of hydrazines with substituted ethyl 4-chloro-1H-pyrazolo[3,4-b]pyridine-3-carboxylates led to formation of 1H,6H-dipyrazolo[3,4-b:3',4'-d]pyridin-3-ones. [Implications for use of the synthesized compounds as tranquilizing and antiinflammatory agents are discussed.].